Method of and machine for folding the edges of rubber sheets.



J. B. PERRAULT. FOR FOLDING THE EDGES '0? EU BEER SHEETS.

METHOD or AND MACHINE APPLICATION FILED IIZB .3, 1914 Patented Sept. 22,1914.

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. J. E; PERR-AULT. nn'rnon' OF AND 1440mm FOR FOLDING THE BDGBS OF RUBBm2 SHEETS. APPLICATION FILED FEB.3, 1914 Patented Spt.22,1914.

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' oke 0k UNITED STATIE Sjj'EENT oriuos.

JOSEPH E. PERRAULT, OF BELMONT, MASSACHUSETTS, ASSIGNOR TO HOOD RUBBER$0., WATERTOWN, MASSACHUSETTS, A CORPORATION OF MASSACI-IfiSETTS.

METHOD or we MACHINE son. FOLDING THE EDGES or Rosana SHEETS.-

of this character a fabric is used which is provided with a facing orcoating of lubber applied by means of a calender, and as the coatedstrip of fabric comes from the calender there is a strip or edge of theunvulcanized rubber which projects beyond the fabric. This must befolded over upon the inner face of'thefabric, and as the edge of thefabric strip is ,of irregular contour, and the rubber unvulcanized andhence of sticky character, this folding operation is one of somedifficulty and has heretofore, so far as I am'aware, only been done byhand.

The obj ect of the present invention, therefore, is to provide a methodand a mechanical device or apparatus for accomplishing this foldingaction in a simple and expeditious manner, and the invention includesthe novel construction hereinafter described and particularly pointedout in the appended claims.

A form of mechanism embodying my invention is illustrated in theaccompanying drawing, in which Figure l is a plan view; Fig. 2 is anendelevation; Fig. 3 is a side elevation; Fig. 4 is a detail view of asample of stock with the edge partly folded, and Fig. 5 is a detailview.

Referring by reference characters to this drawing, the numeral 1designates a suitable bed plate or frame designed to be adapted to anyconvenient support, and ha ring journaled between upwardly extendingbearing lugs 2 a roller 3 over whlch the edge of the stock to be foldedis adapted to be movcd. The stock, which is indicated at A, is held andpassed over the roller by hand, the edge to be folded over by the ma-;chine being indicated at a. As the stock is moved along over the roller3 in the direction of the arrow X in Fig. l, the pro ect Specificationof Letters Patent.

7 Patented Sept.22, 1914.

Application filed February 3, 191 4. Serial No. 816,315.

ing edge of the soft rubber is thrown up-- ward by the action of therapidly arotating folding disk or wheel 4, which is provided with aplain, smooth edge and driven in any suitable manner, as, for instance,by a belt passing over agrooved or pulley portion 4 which isconveniently formed integral with the disk or wheel et. This wheel a isOunnaled on a stud projecting from the carrying bracket 5.' The rotationof the disk or wheel 4 causes the soft rubber as it comes in contactwith the edge of the disk to be thrown upward over and back upon theinner face of the fabric, and it is then pressed down so as to cause itto adhere smoothly to the inner face ofthe fabric by the presserorhammer 6. This presser device has a downwardly extending or elbowportion 6 journaled upon the pin or stud 7, and to the angle or elbow 6is pivotally connected by pin 7 the end of a rod or pitman 8, the otherend of which is eccentrically connected to an operating shaft 9. Iprefer to make this eccentric connection in the shape of a strap 10encircling an eccentric 13' carried by the shaft, with preferably acircular se ries of balls between the strap and eccentric, as shown, andI also prefer to journal the shaft 9 in ball bearings, as shown, anddrive the same from a. pulley 11, though it will be understood, ofcourse, that I do not limit myself to this particular form of drivingmeans.

Having thus described my invention What I claim is i 1. In combination amovable support for the stock to be folded, a rotary disk having itsedge located in proximity to said support, and arranged to rotate in aplane substantially perpendicular to the edge of the stock, and apresser device moving toward and from the face of said support.

2. In combination a roller support, a ro tary folding dislchaving itsedge in proximity to said support and journaledupon an axle lying in ahorizontal plane substa-n tially tangential to the upper face of saidsupport, a presser device or hammer adapted to press the material.operated upon against said. support, and means for oscillating thehammer.

3. In combination a roller journaled upon a horizontal axis, .a diskhaving a smooth edge locatedin proximity to the upper face of said"roller, a'presser device or hammer m projectingj-across the upper faceof the roller, andhaving 3 depending arm pivet'ed updn aifixeds'upp0rt,.a ipitman' pivotally cenhecte'd at one end to said arm and an(30-- 5 centric for operating the opposite end of said pitman,substantially as'described. v

4. The herein described method ofwfoldiing sheets of-unvulcanized orlike adhesive material which consists in causing the edge 10 hi thesheet to progressively contact with a.

smooth' edged disk or.-r011e1-rotating in a JOSEPH PERRAULT.

Witnesses:

'J. R. M TT, L. E. MARK.

whereofyl .afiix my slgnalture'

